:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #16191d;
  --muted: #5d6670;
  --border: #e2e6ea;
  --accent: #1565c0;
  --accent-text: #ffffff;
  --ok: #1e8e3e;
  --off: #9aa3ad;
  --danger: #c62828;
  --badge-hub: #e8f0fe;
  --badge-vd: #f3e8fd;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101317;
    --surface: #181c21;
    --text: #e8eaed;
    --muted: #9aa3ad;
    --border: #2a3037;
    --accent: #5b9cf0;
    --accent-text: #0b1220;
    --ok: #5bd17b;
    --off: #5d6670;
    --danger: #ef6b6b;
    --badge-hub: #1d2a3d;
    --badge-vd: #2c2140;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); line-height: 1.45; }
main { max-width: 880px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: 1.5rem; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 0; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.error { color: var(--danger); }
.center { text-align: center; padding-top: 12vh; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.center-text { text-align: center; }
.row { display: flex; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; gap: 12px; }
.end { justify-content: flex-end; }
.gap { gap: 8px; }

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 1.1rem; }
.logo { color: var(--accent); }
.account { display: flex; align-items: center; gap: 10px; font-size: .9rem; }
.account img { width: 28px; height: 28px; border-radius: 50%; }

button, .btn { font: inherit; cursor: pointer; border-radius: 10px; border: 1px solid transparent; padding: 9px 16px; }
.btn { background: var(--accent); color: var(--accent-text); text-decoration: none; font-weight: 600; display: inline-flex; align-items: center; gap: 10px; }
.btn.google { background: var(--surface); color: var(--text); border-color: var(--border); padding: 12px 20px; }
.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.ghost.small, button.small { padding: 6px 10px; font-size: .85rem; }
.danger { color: var(--danger); }
button:disabled { opacity: .5; cursor: default; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 16px; margin-top: 16px; }
.hub-name { cursor: text; }
.devices { list-style: none; margin: 12px 0 0; padding: 0; }
.devices li { display: grid; grid-template-columns: 14px 1fr auto; gap: 12px; align-items: center; padding: 10px 0; border-top: 1px solid var(--border); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--off); }
.dot.on { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent); }
.badge { font-size: .72rem; font-weight: 600; padding: 2px 8px; border-radius: 99px; margin-left: 6px; }
.badge.hub { background: var(--badge-hub); }
.badge.vd { background: var(--badge-vd); }
.device-meta { font-size: .82rem; color: var(--muted); }
.device-actions { display: flex; gap: 6px; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }
.hint { font-size: .85rem; color: var(--muted); padding: 10px 0 0; border-top: 1px solid var(--border); margin-top: 12px; }

dialog { border: 1px solid var(--border); border-radius: 16px; background: var(--surface); color: var(--text); padding: 0; max-width: 420px; width: calc(100% - 32px); }
dialog::backdrop { background: rgb(0 0 0 / .45); }
.dialog { padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.steps { margin: 0; padding-left: 20px; font-size: .92rem; }
.qr { background: #fff; border-radius: 12px; padding: 12px; margin: 4px auto; width: min(300px, 100%); }
.qr svg { display: block; width: 100%; height: auto; }
.dev { display: flex; gap: 8px; margin-top: 24px; }
.dev input { font: inherit; padding: 8px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); }

@media (max-width: 600px) {
  .devices li { grid-template-columns: 14px 1fr; }
  .device-actions { grid-column: 2; }
}